package com.lml.springcloud.lb;

import org.springframework.stereotype.Component;

import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * @author luomingliang
 * @date 2020/5/6 11:05
 */
@Component
public class MyLB implements LoadBalancer{

    private AtomicInteger atomicInteger = new AtomicInteger(0);

    public final int getAndIncrement(){
        int current;
        int next;
        do {
            current = atomicInteger.get();
            next = current >= 2147483647 ? 0 : current + 1;

        } while (!this.atomicInteger.compareAndSet(current,next));
        //compareAndSet(current,next) ?????????
        System.out.println("******第几次访问,次数next:"+next);
        return next;
    }

    //负载均衡算法: rest接口第几次请求数 % 服务器集群总数量 = 实际调用服务器位置下标,  每次服务器重启后rest接口计数从1开始
//    @Override
//    public ServiceInstance instances(List<ServiceInstance> serviceInstances) {
//        int index = getAndIncrement() % serviceInstances.size();
//        return serviceInstances.get(index);
//    }

}
